Pipe puller for wells



Sept; 17, 1929. w. H. HAUCK PIPE PULLER FO@ WELLS Filed Jan. 22, 1929 INVENTOR.

' ATTORNEY.

Patented Sept. 17, 1929l UNITED STATES yWILMAM H. HAUCK, OFUTICA, 'SOUTH DAKOTA MPE PULLER nonr y.warms substitute fof applicati@ serial No. 204,082, inea July 7, `1927'.

serial No. 334,325.

This applicationisa substitute for application Serial Number 204,082, filed July 7, 1927.

This invention relates to devices for pull ing pipes from Wells, and particularly to those pullers having a body provided with downwardly and outwardly inclined portions and wedges slidable down these inclined portions but acting towedge against the inner lo face of the pipe to be pulled when the puller is raised.

The general object'of the present invention is to provide improved means for this purpose which includes a rod which operatively l5 shifts the wedging devices so that as the rod is lowered the wedging devicesor body will be lowered and asthe rod is raised the wet ging devices and the body will be pulled out with the well tube or pipe.

My invention is illustratedy in the accomlpanying drawing, wherein Figure 1 is a vertical sectional view through a pipe puller 4constructed in accord ance with my invention;

Figure 2 is a like view to Figure 1 but showing the pulling dogs in their expanded posi tion;

Figure 3 is a bottom plan view of the pulling dogs;

Figure 4 is a bottom plan view of the body of the device.

Referring to the drawing, designates a body formed with a central bore 11, the upper end of the bore being screw-threaded, as at 12. The upper end of the body is formed with exterior screw-threads 13 whereby a pipe may be engaged with the upper end of the hollow body to raise or lower the body into the well. The lower end of the body is cut away at 14 on opposite sides. This lower end of the body, as shown in Figure 4, has curved end faces and flattened side faces and the curved end faces 15 extend upward and inward. The lower ends of the portions 16 which are defined by the cut-away portions 14 are formed `with the inwardly extending kerfs 17 and with a central aperture 18.

Extending downward through the entire length of the body and out from the opening 18 is a rod 19, which somewhat below its up- Thisk application mea January 2,2, 1929,

per end is formedr with a relatively short screw-threaded portion 20 and yabove this screw-threaded portion 20 there is ascrewthreadedfportion 20a.'k The screw-threaded portion 20 projects out' beyond this Screw- 1 threaded rod.y The lower end of `this rod carries upon it a collar 21 and below this collar there is provided a nut 22 which engages the screw-threaded'end of `the rod and there is provided the key 23 which holds this nut in place against accidental removal.

Mounted upon the exterior faces of the rounded ends 15 are the two dogs or wedges 24C,` each dog ork wedge being approximately crescent-shaped in cross section so as to embrace the portions 1G. Each dog tapers along the middle line from ythe top of the dog downward so that this middle portion 25 of the dog is tapered to the' same taper as the upward taper of the portion 16. It will be obvious now that when these dogs are in a raised position, the' outer,k faces of ythe dogs ywill be flush with the outer face ofthecylindrical'portion 10 but that as the dogsare shifted downward they will project out from this cylindrical portion. These dogs upon their outer faces'are provided'with outwardly projecting teeth 26, the lower end'of each dog being formed with a transversely extending lug 27 which is I,

ylongitudinally slotted,"as at 2.8, and thefmid-l 'dle of each dog a't/its lower endis provided with the inwardly projecting fin 29 disposed `parallel to the length ofthe dog andengaging in the corresponding kerf 17.

It will beobviousnow that if the `dogsbe forced downward, they will' likewise move outward and will bite into'the inner face of 'the surrounding pipe, and that then yifthe body 10 be raised, the pipe will be raised. The rod 19 is for the purpose of holding the wedges or dogs y24 raised when `loweringthe device into the well and then forcing the dogs downward and'into contact with'the well casingfor pipe. The threadsf20 engagetheinut t 30 which is carriedfuponitherweb-12 andthe rod 19 is normally held up bythis engagement? and the dogs 24fare `normally lieldup bythisenffagementp lThe bocyl() is engaged at thethreads lby the drill rods or like elements and in case it be desired to pull up a length of pipe, the body 10 is lowered into the well by means of the drill rods and when it is sufliciently lowered, the rod 19, which may form an extension of the pump rod, is rotated until it has cleared the nut or equivalent screw-threaded member 30.

Vhen this has been done, the rod 19 drops downward of its own weight and the collar 21 engaging the lugs 27 pulls the dogs downward and they are forced laterally outward. The greater the upward pull upon the body 10, the more tightly these dogs will wedge in place and thus the well Jipe may be readily pulled. After the pipe laas been pulled out a certain distance, the well pipe may be held from downward movement and the action repeated. It will be seen that the aperture 28 in the overlapping lugs is elongated so as to permit the dogs to shift laterally.

The screw-threads 20a are for the purpose of engaging a pump rod with the rod 19 and these threads 2()a are located as far above the threads 20 as the wedges are long in order to give it enough room to drop. Each puller is made for one kind of pipe, three inches for three-inch pipe, two inches for two-inch pipe, etc.

1While I have illustrated a construction which I believe to be particularly eective for the purpose intended, I do not wish to be limited to the exact details shown except as defined in the appended claims.

I claim 1. A pipe puller for wells including a body having means at its upper end whereby it may be connected to a drill rod, the lower end of the body being cut away to provide opposed upwardly inclined faces defining a downwardly extending wedge-shaped portionA of the body, dogs fitting said faces and wedgeshaped from top to bottom, each dog being provided with outwardly projecting teeth upon its outer face, inwardly extending overlapping slotted lugs attached to the dogs, a longitudinally extending rod extending downward through the body and having a relatively short screw-thread intermediate its ends adapted to engage with the upper end of the body, the lower end of said rod being formed with a'collar, the lower end of the rod passing through the slots in the lugs, and a nut holding the slotted lugs in place upon the rod.

2. A pipe puller of the character described including a body screw-threaded at its upper end for engagement with a drill rod, the lower end of the body being cutaway upon its opposite faces to provide two transversely curved faces, a rod extending downwardly entirely through the body, the rod intermediate its ends being formed with a relatively short screw-thread larger than the diameter of the rod and having screw-threaded engagement with the upper end of the body, trans'- versely curved dogs tting around the cutaway portion of the body and having middle portions tapered downwardly, said dogs being formed with teeth upon their outer faces and the lower ends of the dogs having inwardly extending overlapping lugs formed with coincident slots through which the rod passes, means for holding the dogs from rotation upon the body, and means on the rod between which the lugs of the dogs are detachably'engaged.

3. A pipe puller of the character described including a body screw-threaded at its upper end for engagement with a drill rod, the lower end of the body being cut away upon its opposite faces to provide two transversely curved faces, a rod extending downward entirely through the body, the rod intermediate its ends being formed with a relatively short screw-thread larger than the diameter of the rod and having screw-threaded engagement with the upper end of the body, transversely curved dogs fitting around the cut-away portion of the body and having middle portions tapered downwardly, said dogs being formed with teeth upon their outer faces and the low er ends of the dogs having inwardly extending overlapping lugs formed with coincident slots through which the rod passes, a lin projecting inward from the middle portion of each dog at its lower end, the central lower end of the body being formed with radially extending kerfs into which said fins project, and means on the rod between which the lugs of the dogs are detachably engaged.

In testimony whereof I hereunto affix my signature.

' WILLIAM I-I. HAUCK.

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